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if A then B if B then C If C then D If all of the statements

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Manager
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if A then B if B then C If C then D If all of the statements [#permalink] New post 11 Mar 2008, 07:16
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A
B
C
D
E

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if A then B
if B then C
If C then D
If all of the statements above are true, which of the following must also be true?

A) If D then A
B) if not B then Not C
C) If not D then Not A
D) If D then E
E) if not A then not D

Please explain ur answer.

Thanks
Director
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Re: Critical Reasoning A and B [#permalink] New post 11 Mar 2008, 07:34
if A then B
if B then C
If C then D
If all of the statements above are true, which of the following must also be true?

A) If D then A
Ture, As D can happen if only C happens, and C can happen if B happens and B happens if A happens.

B) if not B then Not C
True, as if B happens then only C happens, so if B is not happening then C will not happen as well.

C) If not D then Not A
False, A leads to B leads to C leads to D. But that does not mean D leads to A.

D) If D then E
False, Nothing about E is talked about.

E) if not A then not D
True, same logic as A but for not happening.
Manager
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Re: Critical Reasoning A and B [#permalink] New post 11 Mar 2008, 07:40
for some reason the answer is c.
Need help with it please.
Intern
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Re: Critical Reasoning A and B [#permalink] New post 09 Feb 2010, 00:58
abhijit_sen was right!
Incorrect question, s'pose!
_________________

Yours faithfully,
Vlad

Re: Critical Reasoning A and B   [#permalink] 09 Feb 2010, 00:58
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